Lexus IS 2018: reliability & common MOT faults

At a glance

How 1,338 first tests went in 2025.

Passed first time: 91 in every 100
Did not pass first time: 9 in every 100122 failed first-attempt tests
The typical car: 7 yearsabout 56,166 miles
First tests counted: 1,338

How we count this. Data: UK MOT open data, 2025. Only Class 4 cars on their first MOT of the year are counted. A car that fails and is fixed at the test station still counts as a fail in the first-attempt rate. These are raw results, not adjusted for age, mileage, or peer mix. The MOT does not test engine or gearbox internals.

Note:

These are patterns across 2018 Lexus IS vehicles in 2025, not a prediction that any one car will have them. Faults are grouped by part of the car. A wear pattern follows age and use more than the way the car was built. They come from MOT defect codes, not manufacturer bulletins, recalls or a diagnosis of any one car.

Tyres

One wear pattern: tyre condition (rear), 3.5 times as often as on similar cars.

Figures below are measured across the 122 failed first attempts in 2025 that had a mileage recorded, which allows a like-for-like comparison.

We only list faults with at least 20 failures and a rate of about 2.0 times that of similar cars, which keeps one-off results out of the list.

Tyre condition (rear)

Failed on 38 first tests3.5 times as often as similar carsWear pattern

What it means

Exposed or damaged ply or cords are graded Dangerous. A cut in excess of the requirements and deep enough to reach the ply or cords is Major, and testers may open the cut with a blunt instrument to check its depth. A tyre contacting the vehicle through flexing or suspension movement is not a defect; fouling fails only at the time of test.

Data: UK MOT open data, 2025. Compared with cars of the same age and mileage.

MOT pass rates

How first tests ended, and how the pass rates are counted.

Passed first time: 91in every 100; Passed on the first test.
Fixed at the station: 2in every 100; Failed, then fixed at the test station the same day.
Failed: 7in every 100; Did not pass, and were not fixed at the test station.

First-attempt pass 90.9% of 1,338 first tests (2025): only cars that passed first time count. Official-style pass 93.1%: cars fixed at the test station also count as a pass. The 2 fixed and the 7 not fixed make the 9 in every 100 that did not pass first time.

Same model, other years

Passed first time in every 100, all tested in 2025.

Newer cars are younger, so look for a jump rather than the climb.

Year	Passed first time	First tests
2000	65 in every 100	305
2001	71 in every 100	613
2002	66 in every 100	864
2003	66 in every 100	1,069
2004	65 in every 100	1,218
2005	66 in every 100	1,295
2006	69 in every 100	2,272
2007	70 in every 100	2,839
2008	74 in every 100	2,328
2009	73 in every 100	2,138
2010	75 in every 100	2,076
2011	78 in every 100	1,397
2012	82 in every 100	855
2013	83 in every 100	1,609
2014	85 in every 100	2,925
2015	86 in every 100	2,603
2016	85 in every 100	1,827
2017	90 in every 100	1,457
2018 This car	91 in every 100	1,338
2019	89 in every 100	1,075
2020	92 in every 100	516

FAQs

Short answers about how to read this model-year guide.

Is the 2018 Lexus IS reliable?

The 2018 Lexus IS follows the pattern of the model years either side. In 2025, 90.9% of 1,338 first MOTs on the 2018 Lexus IS passed first time (PRS: items fixed at the station the same day, counted as a fail). The official-style rate including PRS is 93.1%. Among 122 failed first-attempt MOT tests (test year 2025), we highlight MOT failure patterns that show up more often than on cars of a similar age and mileage when the sample is large enough to trust. There is no single reliability score here; this is a pre-purchase checklist built from DVSA open data, not a guarantee for any individual car.

What does this Lexus IS 2018 MOT report cover?

This page highlights MOT failure patterns for the 2018 Lexus IS (registration year) using UK DVSA open data for the selected test year. Patterns are compared with cars of a similar age and mileage. It is a buyer checklist from MOT defect statistics, not a full service history or manufacturer service-bulletin list.

Does this include engine and gearbox problems?

No. MOT tests do not cover engine internals, gearboxes, or many electronic modules. Patterns here come from MOT defect statistics only and should not be read as engine or gearbox reliability scores.

About this data

How this page is built and what it can (and can't) say.

These figures come from UK MOT open data for this model year. We surface common failure patterns against similar cars, not a full reliability score, and not a pass/fail verdict on any individual vehicle.

2024 2025

What we include

UK Class 4 cars only. Normal MOT tests (not retests); first test per vehicle per calendar year; results pass, PRS, or fail.

Same-day repairs

PRS means the car failed items that were fixed at the test station and then passed the same day. We count PRS as a first-attempt fail in headline rates so same-day repairs do not hide problems.

How we compare

We compare this model year with other Class 4 cars of similar age and mileage in the same test year. This model family is left out of the peer group so the car is not measured against itself.

What this does not cover

MOTs do not cover engine internals, gearboxes, or many electronics; this is not a full reliability score.
Common faults come from MOT defect stats, not manufacturer TSBs or recalls.
Age and mileage matching reduces, but does not remove, differences in how cars were used and maintained.
If the data for a car is too thin to say anything useful, we say so rather than guess.

Contains public sector information licensed under the Open Government Licence v3.0.